listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user

{
  "id": "0309a5cec33b51cecf60ee84bc1c118dec5d851a847aeaa9efed36af63b76807",
  "url": "https://osv.dev/vulnerability/CVE-2025-49136",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user",
    "summary": "listmonk is a standalone, self-hosted, newsletter and mailing list manager. Starting in version 4.0.0 and prior to version 5.0.2, the `env` and `expandenv` template functions which is enabled by default in Sprig enables capturing of env variables on host. While this may not be a problem on single-user (super admin) installations, on multi-user installations, this allows non-super-admin users with campaign or template permissions to use the `{{ env }}` template expression to capture sensitive environment variables. Users should upgrade to v5.0.2 to mitigate the issue.",
    "evidence": "osv:CVE-2025-49136",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2025-49136",
      "aliases": [
        "CVE-2025-49136",
        "GHSA-jc7g-x28f-3v3h",
        "GO-2025-3745"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/knadh/listmonk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3894571d1ac0b5baa5bcb15a173e4e1020d7a113"
                },
                {
                  "fixed": "d27d2c32cf3af2d0b24e29ea5a686ba149b49b3e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "5.0.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d27d2c32cf3af2d0b24e29ea5a686ba149b49b3e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d27d2c32cf3af2d0b24e29ea5a686ba149b49b3e"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.0.2"
                  },
                  {
                    "cpe": "cpe:2.3:a:nadh:listmonk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "5.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.0.1",
            "v5.0.0",
            "v4.1.0",
            "v4.0.1",
            "v4.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-49136.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.783334354Z",
      "provider": "osv",
      "references": [
        "https://github.com/knadh/listmonk/releases/tag/v5.0.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/49xxx/CVE-2025-49136.json",
        "https://github.com/knadh/listmonk/security/advisories/GHSA-jc7g-x28f-3v3h",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-49136",
        "https://github.com/knadh/listmonk/commit/d27d2c32cf3af2d0b24e29ea5a686ba149b49b3e"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1336"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/49xxx/CVE-2025-49136.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-49136",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496640,
  "published_at": "2025-06-09T16:21:48.266+00:00"
}